jefflongo / gamecubecontrolleranalyzer Goto Github PK

N64 and GameCube controllers use the same underlying protocol. Refactor such that command decoding is implemented as a high level analyzer, so that the low level analyzer can be shared between both controller types.

Currently blocked on Saleae not allowing HLA's to operate on custom LLA's.

I was about to write my own PulseView analyzer for JoyBus protocol but noticed someone already made one for Logic. Neat!

I gave it a try but there seems to be a problem with command stop bits. It handles console command stop bits as 1's and parses them with following bits as the data:

Command: 0x00
Response: 0xd40000 but should be 0xa80000

I assume, based on the screenshot from the repo that you just count the time from last rising edge and when it's longer than 4us it identifies it as a stop bit. This is not going to work with some devices i.e. Wavebird receiver because the response can occur immediately.
Another idea that comes to my mind is that you can use known command lengths from the list here: https://sites.google.com/site/consoleprotocols/home/nintendo-joy-bus-documentation/gamecube-controller?authuser=0 and just cross check where the command should end. This is not perfect because custom devices like https://github.com/Aurelio92/GCPlus-2.0 use extra commands.

My setup:

• the cheapest Chinese 8 channel 24MHz logic analyzer based off Saleae Logic
• Mac OS 11.5.2
• Logic 1.2.18
• Wavebird wireless receiver

Hi! I'm a Product Manager at Saleae and we’ve made improvements to our analyzer build process. Specifically, we cleaned up the build system, and switched to cmake, so there aren't multiple project files anymore. By implementing the changes outlined here you will be able to provide the community automatic builds in addition to a simplified build system. Let us know if you think you can make the changes or if you’d like us to make the changes for you.

Additionally, if you would like to update your analyzer so that results appear in Logic 2’s data table you can follow the steps outlined here. Note that if you upgrade your analyzer to FrameV2 it will not be backward compatible with Logic 1.

We really appreciate your time and effort! Please let us know if you have any feedback or questions. Thanks!